At a glance
OpenJDK Wiki states that ZGC is:
Concurrent
Region-based
Compacting
NUMA-aware
Using colored pointers
Using load barriers
At its core, ZGC is a concurrent garbage collector, meaning all heavy lifting work is done while Java threads continue to execute. This greatly limits the impact garbage collection will have on your application’s response time.
Availability
ZGC is currently only available on Linux/x64, if you with to test it in other platforms you might use a VM or Docker, also JDK 11, JDK 12 or JDK 13 Early Access are needed.
Enabling Eclipse
My setup includes:
- OpenJDK 11 (LTS) from AdoptOpenJDK Linux/x64
- Eclipse Destop IDE from Eclipse Linux/x64
Please note that ZGC is available only on HotSpot JVM, OpenJ9 JVM come with different GCs.
Download and install OpenJDK and Eclipse IDE, you can simply unpack the archives in you home directory, take note of installation paths.
Eclipse startup
Locate the eclipse.ini configuration file in your Eclipse installation directory.
Add the -vm option following these instructions, you may end up with something like:
-vm
/path/to/jdk-11.0.3/bin/java
Change the line containing -XX:+UseG1GC with:
-XX:+UnlockExperimentalVMOptions
-XX:+UseZGC
You may also change the heap size parameters Xms and Xmx to higher values, personally I have quadrupled the values, more on this here.
The result should look like:
-vm
/opt/java/jdk-11.0.3/bin/java
-startup
plugins/org.eclipse.equinox.launcher_1.5.300.v20190213-1655.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.1000.v20190125-2016
-product
org.eclipse.epp.package.jee.product
-showsplash
org.eclipse.epp.package.common
--launcher.defaultAction
openFile
--launcher.defaultAction
openFile
--launcher.appendVmargs
-vmargs
-Dosgi.requiredJavaVersion=1.8
-Dosgi.instance.area.default=@user.home/eclipse-workspace
-XX:+UnlockExperimentalVMOptions
-XX:+UseZGC
-XX:+UseStringDeduplication
--add-modules=ALL-SYSTEM
-Dosgi.requiredJavaVersion=1.8
-Dosgi.dataAreaRequiresExplicitInit=true
-Xms1024m
-Xmx4096m
--add-modules=ALL-SYSTEM
Enjoy
Now you can run Eclipse IDE and enjoy it with your low-pause GC equipped JVM!
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